ZZ454/440 - An aluminum-headed 440 horse monster in a box!

If you’re going to put a big-block in your project car, why not add some aluminum heads into the mix? GM Performance Parts took the venerable 454 HO, swapped the cast iron production heads for a set of our oval-port aluminum castings, and created the ZZ454. Not only do the aluminum cylinder heads flow more air, but you also drop almost 100 pounds off the nose of your car—dramatically improving performance.

The aluminum heads of the ZZ454/440 help make 15 horse improvement over the iron-headed 454 HO. These oval-port aluminum heads use huge 2.25" intake and 1.88" exhaust valves as well as small combustion chambers to add to the efficiency of the 454" big-block. The bottom end includes a Gen VI four-bolt block, a forged steel crank, forged connecting rods, and forged pistons. A roller camshaft with a .510/.540" lift specs delivers a big-block loping idle as well as add to the high performance punch of the entire crate engine.

The ZZ454/440 is delivered as a complete assembly including water pump, balancer, water intake manifold, and 14" automatic transmission flexplate. All you need to do is add your carburetor, ignition, and starter to complete the project. Of course, all of these parts are available through your GM Performance Parts dealer.

Possible Applications

A hot rod that deserves a big-block with aluminum heads

The starting point for a new race car

Any mean Chevelle, Camaro, rod or Corvette

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

ZZ454/440 TECH SPECS:

Part Number:

12498777

Engine type:

Chevy big-block V-8

Displacement (cu in):

454

Bore x stroke (in):

4.25 x 4.00

Block (P/N 12561353):

Cast iron with 4-bolt main caps

Crankshaft (P/N 14096983):

Forged steel

Connecting rods (P/N 10198922):

Forged steel

Pistons (P/N 10215228):

Forged aluminum

Camshaft type (P/N 24502611):

Hydraulic roller

Camshaft lift (in):

.510 intake / .540 exhaust

Camshaft duration (@.050 in):

211'c1 intake / 230'c1 exhaust

Cylinder heads (P/N 12363392):

Aluminum round port; 110cc chambers

Valve size (in):

2.25 intake / 1.88 exhaust

Compression ratio:

9.6:1

Rocker Arms (P/N 12368082):

Stamped steel

Rocker arm ratio:

1.7:1

Water pump (P/N 12484890):

Cast iron, long-style

Flexplate (P/N 10185034):

14"

Recommended fuel:

92 octane

Ignition timing:

4'c1 BTDC

Maximum rpm:

5500

Part #: 12498777

Installation Notes

NOTE: Distributor with melonized steel gear MUST be used with engines with steel camshafts, or engine damage will occur. GMPP HEI distributor P/N 93440806 is recommended.